|Roller Bearings - MAJEC Training Consultants, Inc|
Description, type, operation, and components of roller bearings.
Keywords: vhs; roller bearings; mechanical engineering
|CALCULATION OF POTENTIAL FLOW AROUND PROFILES WITH SUCTION AND BLOWING - JACOB, K|
A METHOD OF COMPUTATION WAS DEVELOPED FOR COMPUTING PLANE INCOMPRESSIBLE POTENTIAL FLOWS AROUND ARBITRARY THICK, CAMBERED PROFILES WITH CONTINUOUS OR DISCONTINUOUS BLOWING OR SUCTION. IT WORKS WITH SOURCE AND VORTEX DISTRIBUTIONS ON THE CONTOUR AND IN THE INTERIOR OF THE PROFILE. AN INTEGRAL EQUATION FOR THE VORTEX DISTRIBUTION ON THE CONTOUR OF THE PROFILE IS ARRIVED AT, THE SOLUTION OF WHICH IS REDUCED TO A LINEAR SET OF EQUATIONS...
Keywords: LOADS (FORCES); ROLLER BEARINGS; THERMODYNAMICS; COMPUTER PROGRAMMING; LUBRICATION
|Design of high speed, high power spindles based on roller bearings - Hernandez-Rosario, Ismael A.|
Keywords: Spindles (Machine-tools; High-speed machining; Roller bearings; Metal-cutting
|PHASE-BOUNDARY IMPEDANCE OF NOBLE METAL ELECTRODES IN THE REGION OF HYDROGEN ADSORPTION. 1: ACTIVATED PLATINUM ELECTRODES - BREITER, M.|
COMPARISONS USING DIRECT AND ALTERNATING CURRENTS, HIGH AND LOW VOLTAGES, AND VARIOUS RANGES ARE DESCRIBED AND CHARTED FOR ATOMIC AND MOLECULAR HYDROGEN WITH THE LINEAR PROPORTIONS OF THE FUNCTIONS.
Keywords: MACHINE TOOLS; ROLLER BEARINGS; SHAFTS (MACHINE ELEMENTS); WOOD; LOADS (FORCES); LUBRICATION; NOISE REDUCTION; SPINDLES
|The study of comets, part 2 - NON|
Flyby missions and systematic observations of comets are projected for studying comet nuclei and cometary dust tail structures.
Keywords: INSTRUMENTS; MACHINERY; ROLLER BEARINGS; SUSPENSION SYSTEMS (VEHICLES); TECHNOLOGY UTILIZATION; BANDS; FAILURE MODES; FRICTION; MECHANICAL DEVICES
|EXPERIMENTAL ULCERS INDUCED BY FORCED IMMOBILIZATION IN THE WHITE RAT. 2: ANATAMOPATHOLOGY OF THE GASTRIC LESIONS DEVELOPMENT OF ULCERATIONS AFTER ENDING IMMOBILIZATION - BONFILS, S.|
GASTRIC ULCERS INDUCED BY FORCED IMMOBILIZATION OF RATS WERE STUDIED. THE LESIONS WERE FOUND TO BE MULTIPLE IN 67 TO 90% OF THE CASES; COMPLETE HEALING OCCURRED BY THE NINTH DAY IN 80% OF THE ANIMALS WITH NO CHRONIC ULCERATION. MICROSCOPIC STUDY SHOWED THE FUNDAMENTAL LESION TO BE A SLOUGH WHICH DETACHES, LEAVING THE ULCER. PREDOMINANT IN THE HISTOLOGIC PATTERN WERE VASCULAR CHANGES IN THE FORM OF CAPILLARY PITS...
Keywords: CYLINDRICAL BODIES; FILM THICKNESS; LUBRICATING OILS; SURFACE LAYERS; ELASTOHYDRODYNAMICS; ELECTRICAL RESISTANCE; ROLLER BEARINGS; SLIDING FRICTION
|A preliminary shield design for a SNAP-8 power system - Clark, M. R.|
SNAP 8 reactor layered lithium hydride and depleted uranium shield design for space applications
Keywords: ACCELERATED LIFE TESTS; BALL BEARINGS; FATIGUE (MATERIALS); LIFE (DURABILITY); LOAD TESTS; ELASTOHYDRODYNAMICS; PERFORMANCE TESTS; ROLLER BEARINGS
|Subsonic wind-tunnel investigation of leading-edge devices on delta wings (data report) - Dhanvada, M. R.|
The drag reduction potential of leading edge devices on delta wings at high lift is presented. Fences, pylon type vortex generators, chordwise slots, and sharp plate extensions were tested on wing models with 60 and 74 degree swept blunt leading edges at angles of attack to 32 degrees. Six component balance and leading edge surface pressure measurements were taken with various geometry and spanwise arrangements of the devices...
Keywords: FRICTION; ROLLER BEARINGS; TORSIONAL VIBRATION; ELASTIC PROPERTIES; HYDRODYNAMICS; LUBRICATION; THIN FILMS
|Ozone concentration in the cabin of a Gates Learjet measured simultaneously with atmospheric ozone concentrations - Briehl, D.|
A Gates Learjet Model 23 was instrumented with monitors to measure simultaneously the atmospheric and the cabin concentrations of ozone at altitudes up to 13 kilometers. Six data flights were made in February 1978. Results indicated that only a small amount of the atmospheric ozone is destroyed in the cabin pressurization system. Ozone concentrations measured in the cabin near the conditioned-air outlets were only slightly lower than the atmospheric ozone concentration...
Keywords: FATIGUE TESTS; WEIBULL DENSITY FUNCTIONS; GEARS; HEAT TREATMENT; ROLLER BEARINGS; VACUUM MELTING; ALLOYS; MICROSTRUCTURE; STEELS; TESTS
|An RC-1 organic Rankine bottoming cycle for an adiabatic diesel engine - Dinanno, L. R.|
A system analysis and preliminary design were conducted for an organic Rankine-cycle system to bottom the high-temperature waste heat of an adiabatic diesel engine. The bottoming cycle is a compact package that includes a cylindrical air cooled condenser regenerator module and other unique features. The bottoming cycle output is 56 horsepower at design point conditions when compounding the reference 317 horsepower turbocharged diesel engine with a resulting brake specific fuel consumption of 0.2...
Keywords: CLEAVAGE; CRYSTALS; POSITIONING DEVICES (MACHINERY); SLICING; ROLLER BEARINGS; SHAFTS (MACHINE ELEMENTS); THRUST BEARINGS
|Application of EREP imagery to fracture-related mine safety hazards and environmental problems in mining - Wier, C. E.|
The author has identified the following significant results. Numerous fracture traces were detected on both the color transparencies and black and white spectral bands. Fracture traces of value to mining hazards analysis were noted on the EREP imagery which could not be detected on either the ERTS-1 or high altitude aircraft color infrared photography. Several areas of mine subsidence occurring in the Busseron Creek area near Sullivan, Indiana were successfully identified using color photography...
Keywords: BALL BEARINGS; PERFORMANCE TESTS; RANGE (EXTREMES); LUBRICATION SYSTEMS; ROLLER BEARINGS; VELOCITY
|A listing of wavenumbers and intensities of carbon dioxide absorption lines between 12 and 20 micrometers - Drayson, S. R|
A listing is given of the wavenumber, intensities at 300, 275, 250, 225, 200 and 175 k and energy of the lower state of CO2 absorption lines between 12 and 20 microns. They are ordered by wave-number and include 19 bands of C-12(O-16)2, 4 bands of C-13(O-16)2, 2 bands of C-12-O-16-O-18 and 1 band of C-12-O-16-O-17. The vibrational and rotational constants and the band intensities used to calculate the line parameters are tabulated.
Keywords: DEFORMATION; LOADS (FORCES); MECHANICAL DRIVES; ROLLER BEARINGS; VIBRATION EFFECTS; NUMERICAL ANALYSIS; ROTATING SHAFTS; STRESS ANALYSIS
|Finite element methods of analysis for high speed viscous flows - NON|
Over the past three years a finite element based procedure for the solution of high speed viscous compressible flows was developed. The approach followed was to compute steady state solutions via a false transient, using an explicit time stepping scheme, and to attempt to improve the solution quality by incorporating adaptive mesh procedures. The main thrust of the work was to continue on the extension of the approach to the solution of some realistic compressible viscous flows...
Keywords: AIRCRAFT ENGINES; ROLLING CONTACT LOADS; CERAMICS; ENGINE PARTS; GAS TURBINE ENGINES; ROLLER BEARINGS; GOVERNMENTS; INDUSTRIES; LABORATORIES; RESEARCH MANAGEMENT
|Overview: Western Regional applications Program (WRAP) status - Norman, S. M|
Interactions with all 14 of the states in the Western Region over the past three years are reviewed from NASA's perspective. Outreach and training programs using the M mobile analysis and training extension van, the University Program, classes at the Ames Center, demonstration tests with state agencies, and surveying the needs of local governments are highlighted. Planned activities, the continuance of ASVT's, and the impact of the budget cuts on NASA'S technology program are also considered.
Keywords: MATHEMATICAL MODELS; LOADS (FORCES); SPHERES; PERFORMANCE PREDICTION; ROLLER BEARINGS; THERMODYNAMICS; ALGORITHMS; ANALYSIS (MATHEMATICS); COMPUTER PROGRAMS; COMPUTERIZED SIMULATION; DYNAMIC CHARACTERISTICS
|A note on the angular Fourier transformation - Santhanam, Balu|
It is demonstrated that an angular Fourier transformation is obtained by making a rotation around the non-compact axis of So(2,1), the Lorentz group in three dimensions.
Keywords: APPLICATIONS PROGRAMS (COMPUTERS); BALL BEARINGS; ROLLER BEARINGS; STRUCTURAL ANALYSIS; USER MANUALS (COMPUTER PROGRAMS); DEFECTS; FINITE ELEMENT METHOD; FLEXIBILITY; RING STRUCTURES
|Extending Rolling Element Bearing Life: The Interdependence of Lubrication, Environment and Material with Dan Snyder|
Dan Snyder discusses rolling element bearings and extending the life of a bearing through a comprehensive look at the environment, lubrication, and material.
Keywords: STLE; society of tribologists and lubrication engineers; rolling element bearings; rolling bearings; roller bearings; extending bearing life; bearing life; The STLE Compass
|Development of passive radiation detectors of improved sensitivity - Chakrabarty, M. R|
The future development of a solid track high energy particle detector is discussed. The goal is to improve the sensitivity and lower the threshold of the detector. One most widely used material for such purpose is a plastic commercially known as CR-39. A scheme is presented which involves changing the formula of the monomer, diethylene glycol-bis-allyl carbonate. This is to be accomplished by substituting some heteroatoms for H and substituting sulfur atoms for oxygen in the ether linkages...
Keywords: BALL BEARINGS; PITTING; RACKS (GEARS); RELIABILITY; SURFACE LAYERS; USER REQUIREMENTS; FATIGUE LIFE; LUBRICATION; ROLLER BEARINGS; ROLLING CONTACT LOADS; SERVICE LIFE; DESIGN ANALYSIS; ELASTOHYDRODYNAMICS; MECHANICAL DEVICES
|Wear mechanism based on adhesion - Yamamoto, T.|
Various concepts concerning wear mechanisms and deformation behavior observed in the sliding wear track are surveyed. The mechanisms for wear fragment formation is discussed on the basis of adhesion. The wear process under unlubricated sliding conditions is explained in relation to the concept of adhesion at the interface during the sliding process. The mechanism for tearing away the surface layer from the contact area and forming the sliding track contour is explained by assuming the simplified...
Keywords: BALL BEARINGS; TRACTION; USER MANUALS (COMPUTER PROGRAMS); OPERATING TEMPERATURE; ROLLER BEARINGS; ROTATING CYLINDERS; SHAFTS (MACHINE ELEMENTS); STEADY STATE; CONVERGENCE; LUBRICANTS; THERMODYNAMIC PROPERTIES
|Automatic force balance calibration system - NON|
A system for automatically calibrating force balances is provided. The invention uses a reference balance aligned with the balance being calibrated to provide superior accuracy while minimizing the time required to complete the calibration. The reference balance and the test balance are rigidly attached together with closely aligned moment centers. Loads placed on the system equally effect each balance, and the differences in the readings of the two balances can be used to generate the calibrati...
Keywords: DYNAMIC MODELS; DAMPING; FINITE ELEMENT METHOD; STEADY STATE; STIFFNESS; JET ENGINES; MAGNETIC BEARINGS; REDUNDANT COMPONENTS; ROLLER BEARINGS; ROTOR DYNAMICS; ROTORS; BALANCE; CHAOS
|Podcast Transcript - Extending Rolling Element Bearing Life with Dan Snyder|
Dan Snyder discusses extending bearing life.
Keywords: STLE; society of tribologists and lubrication engineers; Dan Snyder; bearing life; rolling element bearings; roller bearings; rolling bearings; extend life of bearings
|Procedures for Computing Transonic Flows for Control of Adaptive Wind Tunnels - Rebstock, Raine|
Numerical methods are developed for control of three dimensional adaptive test sections. The physical properties of the design problem occurring in the external field computation are analyzed, and a design procedure suited for solution of the problem is worked out. To do this, the desired wall shape is determined by stepwise modification of an initial contour. The necessary changes in geometry are determined with the aid of a panel procedure, or, with incident flow near the sonic range, with a t...
Keywords: AIRCRAFT ENGINES; J INTEGRAL; LIFE (DURABILITY); NUMERICAL ANALYSIS; PREDICTION ANALYSIS TECHNIQUES; STRESS DISTRIBUTION; BOUNDARY VALUE PROBLEMS; CRACK PROPAGATION; FRACTURE MECHANICS; LOADS (FORCES); ROLLER BEARINGS; STRESS INTENSITY FACTORS; FAILURE ANALYSIS; FATIGUE (MATERIALS)
|Microgravity Science and Applications. Program Tasks and Bibliography for FY 1993 - NON|
An annual report published by the Microgravity Science and Applications Division (MSAD) of NASA is presented. It represents a compilation of the Division's currently-funded ground, flight and Advanced Technology Development tasks. An overview and progress report for these tasks, including progress reports by principal investigators selected from the academic, industry and government communities, are provided...
Keywords: FINITE ELEMENT METHOD; GEARS; METAL GRINDING; NOISE REDUCTION; WEIGHT REDUCTION; HELICOPTER PROPELLER DRIVE; NUMERICAL CONTROL; ROLLER BEARINGS; ROTARY WING AIRCRAFT; TRANSMISSIONS (MACHINE ELEMENTS); AIRCRAFT RELIABILITY; AIRCRAFT SAFETY; COMPUTER PROGRAMS